FVXX21 KWBC 281230
VOLCANIC ASH ADVISORY STATEMENT 
ISSUED 1230 UTC 28 APR 2000 BY THE WASHINGTON VAAC 
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TUNGURAHUA 00-498         ECUADOR 0128S 7826W 
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BACKGROUND:    TUNGURAHUA ECUADOR (1502-08)
               SUMMIT HEIGHT 16480 FT (5023 M)
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SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED AND
MULTISPECTRAL IMAGERY. 6 HOUR FORECAST FROM THE 28/0600 UTC
AVIATION MODEL.
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ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS.   
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DETAILS OF ASH: SATELLITE IMAGERY THROUGH 28/1145 UTC SHOWS A
VERY FAINT AND THIN PLUME EXTENDING TO THE WEST AWAY FROM THE
SUMMIT.  THIS PLUME IS 14 KM (8 NMI) IN LENGTH AND 
2 KM (1 NMI) IN WIDTH.
THE PLUME EXTENDS TO THE POINT: 0126S 7833W.  HEIGHT OF ASH
MOVING IN THIS DIRECTION WOULD BE FROM THE SUMMIT TO FL250
BASED ON WIND FORECAST DATA.
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TRAJECTORY: ASH TO FL250 WOULD MOVE TOWARDS THE WEST AT 20
KNOTS.
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OUTLOOK: SEE SIGMETS AND VAFTAD.
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THE NEXT STATEMENT WILL BE ISSUED BY 28/1830 UTC.
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REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC
ASH ADVISORY STATEMENTS OFTEN ACCOMPANIED BY A MAP DEPICTING
ASH LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS
http://www.ssd.noaa.gov/VAAC/washington.html
(all lower case except /VAAC/)
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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WALTER
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